<template>
  <div class="goodsinfo-container">

    <!--购物车小球-->
    <transition
      @before-enter="beforeEnter"
      @enter="enter"
      @after-enter="afterEnter">
      <div class="ball" v-show="ballFlag" ref="ball"></div>
    </transition>
    <!--商品轮播区域-->
    <div class="mui-card">
      <div class="mui-card-content">
        <div class="mui-card-content-inner">
          <swiper :lunbotuList="lunbotuList" :isfull="false"></swiper>
        </div>
      </div>
    </div>
    <!--商品购买区域-->
    <div class="mui-card goodsbuy">
      <div class="mui-card-header">{{goodsinfo.title}}</div>
      <div class="mui-card-content">
        <div class="mui-card-content-inner">
          <p class="price">
            市场价:
            <del>￥{{goodsinfo.market_price}}</del>&nbsp;&nbsp;销售价: <span class="now">￥{{goodsinfo.sell_price}}</span>
          </p>
          <p>购买数量:
            <numbox @getcount="getSelectedCount" :max="goodsinfo.stock_quantity"></numbox>
          </p>
          <p>
            <mt-button type="primary" size="small">立即购买</mt-button>
            <mt-button type="danger" size="small" @click="addToShopCar">加入购物车</mt-button>
          </p>
        </div>
      </div>

    </div>
    <!--商品参数区域-->
    <div class="mui-card">
      <div class="mui-card-header">商品参数</div>
      <div class="mui-card-content">
        <div class="mui-card-content-inner">
          <p>商品货号: {{goodsinfo.goods_no}}</p>
          <p>库存情况: {{goodsinfo.stock_quantity}}件</p>
          <p>上架时间: {{goodsinfo.add_time | dateFormat}}</p>
        </div>
      </div>
      <div class="mui-card-footer">
        <mt-button type="primary" size="large" plain @click="goDesc(id)">图文介绍</mt-button>
        <mt-button type="danger" size="large" plain @click="goComment(id)">商品评论</mt-button>
      </div>
    </div>
  </div>
</template>

<script>
  import {Toast} from 'mint-ui';
  import swiper from '../subcomponents/swiper.vue';
  import numbox from '../subcomponents/goodsinfo_numbox.vue';

  export default {
    data() {
      return {
        id: this.$route.params.id,//获取url里的id参数
        lunbotuList: [],//轮播图对象
        goodsinfo: {},//商品信息对象
        ballFlag: false,//控制小球隐藏和显示
        selectedCount: 1//商品数量，默认数量为1
      }
    },
    created() {
      this.getLunbotu();
      this.getGoodsInfo();
    },
    methods: {
      getLunbotu() {
        this.$http.get('api/getthumimages/' + this.id)
          .then(result => {
            if (result.body.status === 0) {//成功的

              //循环遍历每一项，添加img属性
              result.body.message.forEach(item => {
                item.img = item.src;
              });
              this.lunbotuList = result.body.message;
            } else {//失败的
              Toast('获取轮播图失败！');
            }
          })
      },
      getGoodsInfo() {
        this.$http.get('api/goods/getinfo/' + this.id)
          .then(result => {
            if (result.body.status === 0) {//成功的
              this.goodsinfo = result.body.message[0];
            } else {
              Toast('获取商品信息失败！');
            }
          })
      },
      goDesc(id) {
        //编程式导航 点击进入图文介绍页面
        this.$router.push({name: 'goodsdesc', params: {id}});
      },
      goComment(id) {
        //点击进入评论页面
        this.$router.push({name: 'goodscomment', params: {id}});
      },
      addToShopCar() {
        this.ballFlag = !this.ballFlag;
        //添加到购物车
        //拼接出一个商品数据对象
        var goodsinfo = {
          id: this.id,
          count: this.selectedCount,
          price: this.goodsinfo.sell_price,
          selected: true
        };
        //调用store中的mutations里的方法
        this.$store.commit('addToCar', goodsinfo);
      },
      beforeEnter(el) {

        el.style.transform = 'translate(0,0)';
      },
      enter(el, done) {
        el.offsetWidth;

        //获取小球和徽标在页面中的位置
        const ballPosition = this.$refs.ball.getBoundingClientRect();
        const badgePosition = document.getElementById('badge').getBoundingClientRect();

        const xDist = badgePosition.left - ballPosition.left;
        const yDist = badgePosition.top - ballPosition.top;
        el.style.transform = 'translate(' + xDist + 'px,' + yDist + 'px)';
        el.style.transition = 'all .8s cubic-bezier(.01,-0.18,1,-0.01)';
        done();
      },
      afterEnter(el) {
        this.ballFlag = !this.ballFlag;
      },
      getSelectedCount(count) {
        //当子组件把数量传递给父组件时，保存到selectedCount
        this.selectedCount = count;
      }
    },
    components: {
      swiper,
      numbox
    }
  }
</script>

<style lang="scss" scoped>
  .goodsinfo-container {
    background-color: #eee;
    overflow: hidden;


    .ball {
      width: 15px;
      height: 15px;
      border-radius: 50%;
      background-color: red;
      position: absolute;
      top: 392px;
      left: 152px;
      z-index: 999;
    }


  }

  .now {
    color: red;
    font-size: 16px;
    font-weight: bold;
  }

  .mui-card-footer {
    display: block;

    button {
      margin: 5px 0;
    }
  }
</style>